Rp28604 delta tub shower faucet

Ran into one of these the other day,found out that delta discontinued the rp28604 1700 series tub/shower faucet,I can't find what is supposed to replace this cartridge,anybody know???it is the moniter also,I tried a 1700 series my supply house gave me but it did not work,it was a rp46463 model

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